Need advice: Still high temps. What RPM is good?

[plimmplamm]

Thanks for this great project first of all.

Can I ask you all what RPM you are using?
My 6RU Server rack is at 40 degree celsius with 100% voltage and 1150 RPM.
Might have to use a stronger fan.

Also, what causes the fan to run at 1150 RPM even though it can do 1500?

Thanks for your hep

[patrickcollins12]

yes, add a 2nd or 3rd fan to move more air and check the ventilation in and out.

As for the lower RPM it's possibly because you haven't removed my 80% max limit that I added to prevent my fans getting too noisy.